Designation of fingerprint glycopeptides for targeted glycoproteomic analysis of serum haptoglobin: insights into gastric cancer biomarker discovery
Abstract
Gastric cancer (GC) is one of the leading causes of cancer-related death worldwide, largely because of difficulties in early diagnosis. Despite accumulating evidence indicating that aberrant glycosylation is associated with GC, site-specific localization of the glycosylation to increase specificity and sensitivity for clinical use is still an analytical challenge. Here, we created an analytical platform with a targeted glycoproteomic approach for GC biomarker discovery. Unlike the conventional glycomic approach with untargeted mass spectrometric profiling of released glycan, our platform is characterized by three key features: it is a target-protein-specific, glycosylation-site-specific, and structure-specific platform with a one-shot enzyme reaction. Serum haptoglobin enriched by immunoaffinity chromatography was subjected to multispecific proteolysis to generate site-specific glycopeptides and to investigate the macroheterogeneity and microheterogeneity. Glycopeptides were identified and quantified by nano liquid chromatography–mass spectrometry and nano liquid chromatography–tandem mass spectrometry. Ninety-six glycopeptides, each corresponding to a unique glycan/glycosite pairing, were tracked across all cancer and control samples. Differences in abundance between the two groups were marked by particularly high magnitudes. Three glycopeptides exhibited exceptionally high control-to-cancer fold changes along with receiver operating characteristic curve areas of 1.0, indicating perfect discrimination between the two groups. From the results taken together, our platform, which provides biological information as well as high sensitivity and reproducibility, may be useful for GC biomarker discovery.
Graphical abstract
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Keywords
Mass spectrometry Glycoproteomics Site-specific glycosylation Glycopeptide Gastric cancerNotes
Acknowledgements
This work was supported by Korea Basic Science Institute grant (T37413) and by the Institute for Basic Science (IBS-R001-D1-2017-a00).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no competing interests.
Ethics approval and consent to participat
Human sera were collected by the National Biobank of Korea by means of a standardized protocol approved by the Ethics Committees of Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea (KH2010-15). Informed consent was provided by all individuals involved in the study.
Supplementary material
References
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